在英语中，“肚子痛”可以说成"I have a stomachache." 来源：肚子痛的感觉是由于胃部或者肠道的不适引起的。在英语中，“stomach”是指胃部，而“ache”是指疼痛的感觉。

例句：

"I have a stomachache. Can you please give me some medicine?"

"I think I ate something bad. My stomach hurts really badly."

"I have a stomachache. Can we reschedule our meeting for tomorrow?"